Issue 25, 2024

Impact of supporting nanometric membranes on the thermo-optical dynamics of individual plasmonic nanodisks

Abstract

The thermal dynamics and transient optical response of individual gold nanodisks supported on thin silicon nitride membranes were investigated using optical time-resolved pump–probe spectroscopy and finite-element modeling. The effect of reducing the membrane thickness from 50 nm to 15 nm on the nanodisk thermal dynamics was explored. A significant deceleration of the nanodisk cooling kinetics was observed, and linked to a quasi-two-dimensional heat diffusion process within the 15 nm thick membrane, without detectable modification of its thermal conductivity. Systematic measurements involving different optical probe wavelengths additionally revealed the contribution of indirect membrane heating to the measured time-resolved signals, an effect particularly pronounced in the spectral range where direct optical heating of the nanodisk induces minimal ultrafast modifications of its extinction cross-section.

Graphical abstract: Impact of supporting nanometric membranes on the thermo-optical dynamics of individual plasmonic nanodisks

Article information

Article type
Paper
Submitted
12 Mar 2024
Accepted
24 May 2024
First published
28 May 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2024,16, 12071-12080

Impact of supporting nanometric membranes on the thermo-optical dynamics of individual plasmonic nanodisks

C. Panais, N. Lascoux, S. Marguet, P. Maioli, F. Banfi, F. Vallée, N. Del Fatti and A. Crut, Nanoscale, 2024, 16, 12071 DOI: 10.1039/D4NR01060D

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